let obj={
    bbc:'333',
    abc:'111',
    aaa:'666'
}

console.log(JSON.stringify(obj,null,' '));

console.log(xx.__proto__);
console.log(student.protitype);

var student ={
    name: 'robot',
    age: 18,
    heigth: function(){
        console.log(this.name + '身高1.7米')
    }
};

var xiaoming = {
    name: '小明'
};

xiaoming.__proto__ = student; 


